This was the Mail quote.
"Last night West Yorkshire Police said an 'investigation is ongoing', the first time it has confirmed the MP (Naz Shah)is under suspicion."
http://www.dailymail.co.uk/news/article-3773718/Police-probe-MP-Naz-Shah-online-anti-Israel-rant-Labour-let-in.html#ixzz4JYQBkFDR
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Whatever your opinion of the paper, that is not something they could get away with making up.
The quote is genuine, and other papers have run it.